Frequency pole-changer.



A. H. WESS. FREQUENCY EoLE CHANGER.

APPLICATION FILED NOV. 15, 1906.

Patented Apr. 1, 1913.

UNITED srnrnsrnrnur OFFICE. y

ALFRED :IL 'YWEISSV, 7 fFf UHIGGO, ILLINOIS, JLASSIGNOB''Q "KEIL'OGG SWITCH-BOARD' &

l sUrrLY coMPnNm-or omoAsoJrLLrNorsgn coaPoRATroNpor-Innmors.

l-Speeicatiion of Letters'latent.-

Application filed November 15, 1906. Serial No.343,541.

To all whom t may concern: f

- Be it-known that I, ALFRED H.`WE1ss, a

. citizen of the United States, residingin Chicarrying out the above7 cago, county of Cook, and State of'lllinois,

have ,invented certain new and useful Imrovemerits` in Frequency Pole-Changers, of

which the following is a specification.

My invention relates to frequency pole changers of the type used inconnection with telephone systems provided with party lines having annunciators at -the substations adaptedto be -operatedby alternating currents of. -diiferent frequencies. `1

The object ofamy invention is to provide the apparatus and vcircuits Ynecessary for of a more simple form than has heretofore been known, and to eliminate a number of parts which in former @mechanisms have been necessary to the operation of the devices;

A further object of my invention is to produce-a device which will convert direct currentinto alternating current of substantially sine wave for-1n.

Other objects iof my vinvention are the means for eliminating the efl'ect of the variation in the direct current used in the device, upon'theprimary source, which is usually the storage-*battery of the telephone system.

Still further objects of. my invention will A be evidenced by the following description l stationary shown in and claims which relate to the accompanying drawings forming ia part of this specification.

In these drawings,-Figure 1 is a front elevation of my device. Fig. 2 is a section of my device taken upon Fig 3 is a section of the device taken upon lline .3, 3 of Fig. A1. Fig. 4 is a section of the device taken upon line 4, tof. Fig. 1. Fig. 5 is a front elevation of the reed-portion of one of the pole-changers. Fig. 6 .is a side elevation of the reed shown in Fig. 5. Figs. 7 and -8-are side-'elevations -of reeds of slower perigds 'of vibration than that vshown in Fig. 45.

1g contacts moved to their alternate bythe vibratile contact 9 which is yits yextreme alternate position by dotted lines. In carrying out my invention, I preferably secure the operating coils 1 to the faceplate 2.by `.means of the adjustable polepieces 3 which thread into the ends of .the cores 4 and have thelock-nuts 5 threaded sitions line 2, 2 of Fig.. f1..`

9 lillustrates -two of the relativelyy IPatentedApnd, 1913.

thereon in such manner as to lock the adi l justable. pole-piecesand at the same time to secure the plate between the nut andthe end of the magnet-core. 'The two`coilsf1 as -shown in Fig. 1 are placed horizontally side by side and are adapted :to actu'ate the armat-ure' of the vibrating reed portion. This reed portion comprises a resilient spring 7 .preferably of steel, the armature 'Shaving the depending portion 16a, the 4tuning device '7a carried thereon,.thel operating contact 8 and theipol'e changing contact 9. x'llhislattercontact 1s carried upon the off-set portion '1Q secured; parallel to the portion -6a` by the .cylindrical posts'll. The resilient portion and the armature may be secured together "by any-means," here shown as rivets 12l passing through the armature and the spring, andfthroug-h the auxiliary riveting block' 13. lt 1s essential that-the spring 7 be secured tothe faceplate in a very rigid and stationary manner. This is accomplished by means of the blocks 14 `and 15v between which the upper end of the springQ-is tightl clamped by means of the screws 16, which pass through both blocks and .into the' face-plate 2, and b means of the center-screw 17 A which passes slmply into the larger block 414.

The stationary operating contactlS., normally in contact with movable contact 8, is carried upon the spring 19 securedltothe insulating block 20 beneath the rigid adjust- Vingscrew carrying strip .21. rlhis strip eX- ,the block and carries the tends out from screw ..22 in such man-ner that the -spring 19 soV may be moved toward and'from the operating Contact 8. V'lhe springs 23 and 24 carry the .pole-changing contacts 25 and 26 normally out of Contact with lthe movable oontact 9, and arranged to be adjusted in the vsame manner as the spring 19.

The contact spring strip-23 and relatively stiff supporting spring 123@ arepositione'd at right angles to the reed and fastened to the ing .as a clamping plate .for said sprin s -23 vand 23a. rlhe said strip 21 carries' an a justl ment screw .22 passing through its slotted end into engagement with spring'QSa, 'the slottedv end clamping the screw in a 4well known manner. Contact spring 23 normally rests under tension against'the -stilf spring 23a7 its contact 25 being normally out of engagement with the armature'or vibratingcontact 9. To adjust the contact spring insulating block 20, the rigid-*strip 21 serv-U 28 the adjustment screw 22 is `turned in the proper direction, thereby acting upon the stiti' spring`23, which in turn acts upon contact spring 23 moving it Aeither toward or away from contact 9, acco-rding to the adjustment required. rlhe contact spring 24 which rests under tension against the relatively stift spring 24a, is adjusted by the associated adjustment screw 22, the said screw 22 passing through an opening in contact spring 2s, into engagement with stili spring 24a' for adjustment of contact spring 24C. The Contact spring 19 is similar to the contact spring 24.-, the associated 4adjustment screw of contact spring 19 passing throughy an opening in said spring 19 to engage its associated stid supporting spring for adjustment thereof.

ln Fig. 9 l have shown the cont-act springs 23, 24, in the positions they assume when engaged by the vibratile contact 9 when moved to its alternate positions, said positions ozt contact 9- being indicatedl by the dotted lines. Also this gure illustrates the manner/in which screw 22 passes through contact spring 24 to engagethe stidening spring 2da this construction being similar to the construction of the'contact" spring 19, its

supporting plate and its screw 22.

Due to the construction and arrangement of the contact springs 19, 23, 24 and their associated adjustable supporting strips, it

'will be seenl that accurate adjustment ot v the contacts can be secured as the adjusting screws are close to the contacts of each contact spring, and furthermore, it will be noted that the adjusting screw serves as a rigid stop for thefstitf springs, thus preventing any undue vibration of the tree ends of the contact springs and consequent follow up motion thereof, Aafter the vibrating contacts of the reed leave the relatively stationary contact springs during the operation of the device.

l preferably mount a plurality or my con- Y verters on a single lfront-board 27 allowing board.

the coils 1 to extend through openings inl this board, thus bringing the face-plates flush with the face of the board. Beneath ythecoils l and secured to the backs of this front-board is the, non-inductive resistance I still further preferably mount the back-board 29. parallelv to` the frontboard, the two boards being secured together by means of the metallic columns 30,' having screws 31 threaded therein from the `front of the aceplate and screws 32 threaded therein from the rear of the back- While I have shown and described my improvements-in connection with certain details it isv to be understood that many variations ma be made 4therefrom without departing rom the spirit or scope of my invention.

1. ln a pole-changer, the combination of a flat vibratile reed comprising a single. conductor having an operating contact, and a pair of pole changing contacts carried thereon in electric connection therewith, a stationary contact to coperate with the operating contact and engaging therewith when the ree-d is not in motion, and a pair of relatively stationary long flat spring contacts, one on each side of and positioned at right angles to the reed out of contact with the vibratile pole changer contacts when thereed is not in motion andadapted to alternately register with said pole-changer contacts when the reed is in motion, said pair of contacts also lying in a plane substantially parallel to a plane through 'the flat or" the reed, substantially as described.

2. In a pole-changer, the combination of a vibratile reed, an auxiliary contact support secured in, metallic connection with the reed, a pair of contacts carried one on each side of said auxiliary support, ,a long liat spring supported at right angles to said reed and carrying a stationary contact between the reed and the auxiliary support and coperating with one of the movable contacts, a long tlat spring supported at right angles to said reed and carrying a stationary contact coperating with the other of said movable contacts, said auxiliary contact support being readily removable from the reed without disturbing the adjustment of either of the stationary contacts, and means for ad- 100 justing the stationary contacts, substantially as described. i

3. In a pole-changer, the combination with a vibratile contact, of a relatively ,stationary contact adapted to beengaged there- 105 by, a flexible member -carrying the latter contact, a sti spring stop lying'along the surface'of t-he irst flexible member and limiting its movement to prevent any consequent follow up motion toward the movable contact, suitable means for rigidly securing said member k`and stop relative to said vibrating contact, and an adjusting screw v:tor adjusting the position of the stili? spring stop without disturbing said rigid securing means. l

et.` In a pole-changer, the combination` with a face-plate, of a reed supported on one side of said plate and carrying a pair, of contacts adapted to vibrate toward and 12o from said face plate, an armature carried by said reed, an electromagnet attached to said plate and adapted to coperatewith said armature to vibrate saidy reed, ay pair of contact springs carried on said plate, one adapted to be engaged by one of said vibrating contacts when the latter is vibrated toward the face-plate, and the other adapt- I ed to be engaged by the other vibrating con-v v tact when the latter is vibrated away from the face-plate, and a pair of adjust-ing screws, each accessible from in front of the y face-plate for regulating the position ofthe contact springs', substantially as described. 5. A pole-changer comprising a face plate, a vibratile reed secured to said plate, a pair 'of contacts carried by said reed and adapted to be vibrated toward and from said plate, a pair of contact spring'strips positioned at right angles to said vibrating reed, said Contact spring strips being adapted to be alternately engaged by said reedl contacts when said reed is vibrating, a still supporting spring lying along the surface 15 i prevent any consequent follow up motion of of each of said spring strips positioned to said cont-act strips during vibration of said reed contacts, means for rigidly fastening said contact spring stripsand supporting springs to said face plate in said relative positions, and adjusting means engaging witnesses.

ALFRED H; WVEISS. Witnesses: l

CLIFFORD C. BRADBURY, EDITH F. GRIER. 

